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Employee Benefit Plans Level 3 (Tables)
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
 
Pension Benefits
Other Postretirement Benefits
 
Three Months Ended March 31,
Three Months Ended March 31,
 
2016
2015
2016
2015
Interest cost
$
59

$
59

$
3

$
3

Expected return on plan assets
(77
)
(78
)
(2
)
(3
)
Amortization of prior service credit
—

—

(2
)
(2
)
Amortization of actuarial loss
14

15

1

1

Net periodic benefit
$
(4
)
$
(4
)
$
—

$
(1
)